You'll pay the 19% VAT and then unless you own it for 12months prior, you'll get 5% duty when you bring it back into country.
That said, €400 in postage and associated insurance is a fair bit of wiggle room to play with alone, and then. I think you just need to get to a point where there's nothing else you actually want...at which point you just don't look at some of these figures, because it's secondary.
If you want a Nicolai, you've got to be IN the market for a Nicolai; gearbox Nicolai is just another story again.
The classic question:
If I had to have ONLY ONE bike, what would it be?
For me, my head flicked back right away to the Nicolai ION G16 GPI that I was eyeing off two years ago, and got quotes for...just wanted a 29er. I'll save the rest of that story for PYR, but that's the aim when I bought it, this is my "grab it if the house is on fire" item.